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Elementary Science Education

# Tom Murzenski

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• in reply to: How Do We Know #8663

Tom Murzenski
Participant

Next class is on 4/14/21 – I’ll see what they say to this!

I like the last point – if you don’t like my theory, come up with your own! This is our origin story of how we became homeschoolers – we didn’t like public school anymore, so we came up with our own school.

in reply to: Gravity Question #8635

Tom Murzenski
Participant

The pull of gravity is constant on all objects. If you drop two soda bottle with a different amount of water in them, they will both hit the floor at the same time, even though one has more mass than the other. If you lose “weight,” you are actually losing mass, so the measure of gravity’s pull on you decreases.

#8437

Tom Murzenski
Participant

It’s been a while, but I have something to add to this question.

I just received a new horseshoe magnet. It came with a small piece of steel that’s big enough to span across the two poles. The piece of metal is called a keeper. Wikipedia says the purpose of the keeper is to preserve the strength of the magnet by completing the circuit and keeping the magnetic domains aligned.

When I dip the horseshoe magnet into filings, it’s covered in filings stuck to the poles. When I dip the horseshoe magnet with the keeper in place into the filings, very few filings stick to the magnet. None stick to the (ferromagnetic) keeper. The only filings that stuck to the magnet are along the edges of the poles where they touch the keeper.

So apparently there is something to the idea of the magnetic field being blocked by short circuiting. Perhaps a tin can just doesn’t have enough oomph to produce the effect.

I never thought of magnetic fields as having a circuit, much less being able to short circuit a magnetic field, so this is all very interesting.

Yay, science!

Tom Murzenski
Participant